
When you ask "What number is halfway between 15 and 80?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=80.

To find the number halfway between 15 and 80, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 80 into our formula, we get:
(15 + 80)/2 = 47.5
Thus, the number halfway between 15 and 80 is 47.5.
To check that our answer is correct, we subtract 15 from 47.5 and subtract 47.5 from 80 and compare the two numbers:
47.5 - 15 = 32.5
80 - 47.5 = 32.5
As you can see, the halfway number is 32.5 higher than 15 and 32.5 lower than 80. Therefore, our halfway between answer of 47.5 above is correct.
Halfway Between
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Halfway Between 15 and 81
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